CN115864742A - Transient temperature control method and device for oil cooling electric drive system and storage medium - Google Patents
Transient temperature control method and device for oil cooling electric drive system and storage medium Download PDFInfo
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Abstract
The invention belongs to the technical field of new energy automobiles, and particularly relates to a transient temperature control method, a transient temperature control device and a storage medium of an oil cooling electric drive system, which are applied to a temperature control device, wherein the method comprises the following steps of obtaining a target output power P1 and a current output power P2 of the oil cooling electric drive system; according to the driving condition, when the output power of the oil-cooled motor changes, the ratio of the target output power P1 to the current output power P2 is obtained, the cooling liquid loop and the cooling oil loop are controlled in parallel, control signals simultaneously enter the oil-cooled motor controller and the thermal management controller, and gears of the cooling liquid loop and the cooling oil loop are changed according to the ratio. The purpose is as follows: through linkage between the cooling oil loop and the cooling liquid loop, the heat dissipation capacity of the whole system is improved, and therefore the output capacity of the motor is improved; meanwhile, the hysteresis of the temperature control method is reduced, and the reliability of the system is improved by using a parallel control method.
Description
Technical Field
The invention belongs to the technical field of new energy automobiles, and particularly relates to a transient temperature control method and device of an oil cooling electric drive system and a storage medium.
Background
The continuous increase of carbon emission is a key factor influencing global climate, wherein the carbon emission of the traditional energy automobile is an important component of the total carbon emission of the society, and the development of a new energy automobile to improve the energy utilization rate is an important technical means for reducing the carbon emission.
Different from the traditional fuel automobile which uses an engine as the driving mode of the automobile, new energy automobiles including plug-in hybrid electric vehicles, extended range vehicles, pure electric vehicles and the like all use an electric driving system as the main or single driving force for the running of the automobile. In the aspect of functional composition, the electric driving system comprises a motor, a motor controller, other electric functional components and auxiliary components, and in the aspect of functional design, the integration is an important direction for the functional development of the electric driving system; in terms of performance technical parameters, the improvement of the torque density and the power density of the motor is an important direction for the development of the performance technical parameters of the electric drive system. The development requirements of all-in-one function development, power density improvement, torque density improvement and the like promote the cooling mode of the motor to be developed from initial air cooling and water cooling to oil cooling. Compare water cooled machine, inside the cooling oil can get into the motor under the drive of oil pump, with the inside more effective contact of the part that generates heat of motor to increase heat transfer ability. Therefore, under the same output power, the oil-cooled motor has the advantages of smaller volume and lighter weight, and meanwhile, the peak output power of the oil-cooled motor is higher than that of the water-cooled motor, so that the oil-cooled motor becomes the mainstream of an electric drive system of a new energy automobile.
For example, in Changan automobile patent 202210434619.8, "oil pump control method and system for oil-cooled motor system and vehicle", the control method disclosed in the patent comprises the following steps: obtaining the working mode of a vehicle, the heating power of a motor, the inlet oil temperature of a radiator and the rotating speed of the motor; when the working mode is any one of a torque mode, a pulse heating mode and a direct-current boosting mode, the rotating speed of a first oil pump in the corresponding working mode is determined according to the heating power of a motor and the oil temperature of a radiator inlet; determining the rotating speed of a second oil pump according to the rotating speed of the motor and the oil temperature at the inlet of the radiator; and taking the larger value of the first oil pump rotating speed and the second oil pump rotating speed as the target oil pump required rotating speed. The invention can effectively cool the oil-cooled motor system in real time with lower energy consumption and can improve the reliability of the oil-cooled motor system.
For example, patent 201910636889.5 of Huashi technology corporation, which discloses a device and a method for controlling an oil-cooled motor, relates to the field of electric automobiles, and is used for controlling the working temperature of the oil-cooled motor. Oil-cooled motor temperature control device includes: the device comprises an oil pump, a heat exchanger, a water pump, a controller and an oil collecting tank; the controller is configured to: acquiring the temperature of lubricating oil in the oil collecting tank; predicting the predicted working condition of the oil-cooled motor according to at least one of the driving mode, the predicted road condition and the driving habit; determining a temperature control target of lubricating oil and a temperature control target of the oil-cooled motor according to the predicted working condition of the oil-cooled motor; controlling the rotating speed of the oil pump according to the predicted working condition of the oil-cooled motor, the temperature control target of the oil-cooled motor and the temperature control target of the lubricating oil; and controlling the rotating speed of the water pump according to the temperature of the cooling liquid flowing into the heat exchanger, the temperature of the lubricating oil in the oil collecting tank, the flow rate of the lubricating oil and the temperature control target of the lubricating oil.
For example, united electronics corporation patent 202110701699.4, "oil-cooled motor online thermal management method, storage medium, motor controller and management system" discloses an oil-cooled motor online thermal management method, which includes: the motor operates; acquiring a real-time rotating speed, a motor output power, a maximum cooling oil inlet-outlet temperature difference allowed under the current rotating speed and a maximum bearable loss value; calculating the motor loss taken away by the cooling oil in real time according to the flow of the cooling oil and the oil temperatures of a cooling oil inlet and a cooling oil outlet; and adjusting the maximum allowable output power of the motor in real time based on the temperature of the inlet and the outlet of the cooling oil at the current moment, the motor loss taken away by the cooling oil, the current maximum allowable temperature difference of the inlet and the outlet of the cooling oil and the maximum loss value capable of bearing, so that the motor is in a thermal safety state. The invention realizes accurate temperature control of the oil-cooled motor with extremely low cost, can avoid damage of the motor caused by over-temperature operation, can reduce the operation risk of the motor, and improves the service life and the safety of the motor.
The drawbacks of the prior art publications are mainly focused on the following aspects:
1. for example, the Changan automobile and other oil-cooled motor temperature control methods disclosed in the Union patent mainly focus on the influence of the control of the oil pump on the temperature of the oil-cooled motor, the output power of the oil-cooled motor is controlled based on the heat dissipation capacity, technical parameters for controlling the oil pump are derived from the output power of the motor and parameters of some accessory systems, and then the temperature control result is obtained based on the parameters, so that the output power of the motor is limited finally. However, the power output of the oil-cooled motor of the new energy automobile is the core of experience, and due to the lack of linkage of an external thermal management system, the limitation degree of the output power of the oil-cooled motor is high, so that the experience of a user can be greatly influenced by the control method.
2. For example, the patent of Hua is a company, and utilizes the linkage of a cooling device (such as an oil pump) of an oil-cooled motor and a vehicle thermal management system. However, the transmission process of the signals of the two is in a serial relation, namely the adjustment of the oil pump is completed, and then the adjustment of the water pump is carried out according to the situation.
Disclosure of Invention
The purpose of the invention is: the transient temperature control method, the transient temperature control device and the storage medium of the oil cooling electric drive system are provided, and the heat dissipation capacity of the whole system is improved through linkage between a cooling oil loop and a cooling liquid loop, so that the output capacity of a motor is improved; meanwhile, the hysteresis of the temperature control method is reduced, and the reliability of the system is improved by using a parallel control method.
In order to achieve the technical purpose, the technical scheme adopted by the invention is as follows:
in a first aspect, the present application provides a method for transient temperature control of an oil cooling electric drive system for use in a temperature control apparatus, comprising the steps of,
acquiring target output power P1 and current output power P2 of the oil cold-electric drive system;
according to the driving condition, when the output power of the oil-cooled motor changes, control signals enter the oil-cooled motor controller and the thermal management controller at the same time, the ratio of the target output power P1 to the current output power P2 is obtained, the power of a cooling liquid loop and the power of a cooling oil loop are changed according to the ratio, and the cooling liquid loop and the cooling oil loop are controlled in parallel;
the oil-cooled motor controller is used for controlling the input power of the cooling oil loop, and the thermal management controller is used for controlling the input power of the cooling liquid loop.
Through to coolant liquid return circuit and coolant oil return circuit parallel control, can the work of synchro control coolant liquid return circuit and coolant oil return circuit to can control the operating condition of oil-cooled motor according to the vehicle at the running state of difference, and then can control the transient state temperature of oil cooling electric drive system, make the work of oil-cooled motor not receive the restriction of temperature state, can promote the driving and experience and feel.
In combination with the first aspect, as some optional embodiments, the method further comprises,
during cooling oil loop control, according to the ratio of the target output power P1 to the current output power P2 and the power of 3/4 of the ratio of P1/P2, the power is used as the power lifting multiplying power of the oil pump;
when the input power of the oil pump after the lifting multiplying power of the oil pump is the next oil pump gear, the oil pump directly enters the next power gear; and when the input power of the oil pump after the lifting multiplying power of the oil pump is smaller than the input power of the next oil pump gear, the input power of the oil pump is unchanged.
The calculated values of the target output power P1 and the current output power P2 are used as the power lifting multiplying power of the oil pump, so that the input power of the oil pump is controlled, the quick heat dissipation of the oil-cooled motor is facilitated, and the output power of the oil-cooled motor is not limited.
In combination with the first aspect, as some optional embodiments, the method further comprises,
when the cooling liquid loop is controlled, the input power of the fan is changed according to the multiplying power of P1/P2 according to the ratio of the target output power P1 to the current output power P2;
when the input power is larger than or equal to the gear of the fan, adjusting the input power of the fan to enter the next gear; and when the input power is smaller than the current gear, the power of the fan is not adjusted.
The power of the fan is controlled through the ratio multiplying power of the target output power P1 and the current output power P2, and quick heat dissipation of the cooling liquid loop is facilitated.
In combination with the first aspect, as some optional embodiments, the method further comprises,
when the cooling liquid loop is controlled, the input power of the water pump is changed according to the ratio of the target output power P1 to the current output power P2 and the multiplying power of P1/P2;
when the oil pump lifts the gear and the fan lifts the gear, the water pump does not lift the gear; when the oil pump does not lift the gear or the fan does not lift the gear, the water pump directly lifts one gear.
The power of the fan is controlled through the ratio multiplying power of the target output power P1 and the current output power P2, the circulation efficiency of cooling liquid in the cooling liquid loop is facilitated, and the heat dissipation effect on the cooling oil loop is enhanced under the condition that the redundancy of the cooling efficiency is not caused.
In combination with the first aspect, as some optional embodiments, the method further comprises,
when the cooling liquid loop is controlled, the opening degree of the active air inlet grille is changed according to the multiplying power of P1/P2 according to the ratio of the target output power P1 to the current output power P2;
when the active air inlet grille enters the maximum opening, the input power of the fan is changed according to the multiplying power of P1/P2, and if the input power is larger than or equal to the gear of the fan, the input power of the fan is adjusted to enter the next gear; if the active air inlet grille is smaller than the maximum opening, the power of the fan is not adjusted;
when the oil pump raises the gear and the fan raises the gear, the water pump does not raise the gear; when the oil pump does not lift the gear or the fan does not lift the gear, the water pump directly lifts one gear.
Through the ratio of the target output power P1 to the current output power P2, the opening degree of the active air inlet grille is controlled, on one hand, the heat dissipation effect of the cooling liquid loop can be further enhanced, on the other hand, the output intensity of the fan can be reduced, and therefore the electric quantity consumption of the whole vehicle is reduced.
The second aspect, the application also discloses a temperature control device, is applied to the aforesaid temperature control method, temperature control device includes oil-cooled motor, coolant liquid return circuit, coolant oil return circuit, oil-cooled machine controller and thermal management controller, the coolant oil return circuit communicates with the oil-cooled motor, the oil-cooled motor includes stator, rotor, oil storage tank and temperature sensor, the oil storage tank sets up the one side at the rotor, temperature sensor sets up on stator, rotor and oil storage tank, the coolant oil return circuit all communicates with stator, rotor and oil storage tank.
In combination with the second aspect, as some optional embodiments, the temperature sensor includes a first temperature sensor, a second temperature sensor, a third temperature sensor and a fourth temperature sensor, the first temperature sensor is disposed at an inlet of the oil-cooled motor, the second temperature sensor is disposed at the stator, the third temperature sensor is disposed at the rotor, and the fourth temperature sensor is disposed on the oil storage tank, so that the temperature of the cooling oil passing through the motor stator, the motor rotor and the oil storage tank can be monitored in real time, and the temperature of the cooling oil entering the motor stator and the motor rotor can be monitored in real time.
In combination with the second aspect, as some optional embodiments, the cooling oil loop includes a filter, an oil pump, a plate heat exchanger and an oil pipe, the oil-cooled motor is communicated with the filter, one end of the oil pump is communicated with the filter, the other end of the oil pump is communicated with the plate heat exchanger, the oil pipe is connected between the plate heat exchanger and the oil-cooled motor, the oil-cooled motor controller controls the input power of the oil pump, and the oil-cooled motor controller is arranged to dissipate heat of the cooling oil passing through the oil-cooled motor through the plate heat exchanger.
In combination with the second aspect, as some optional embodiments, the cooling liquid loop includes a water pump, a heat dissipation member and an electrical function member, one end of the water pump is connected with the heat dissipation member, the other end of the water pump is connected with the cooling oil loop, one end of the electrical function member is connected with the cooling oil loop, the other end of the electrical function member is connected with the heat dissipation member, the thermal management controller is used for controlling the input power of the water pump and the heat dissipation member, and the arrangement is such that, on the one hand, the cooling oil loop can be cooled, so that the heat dissipation capability of the cooling oil loop is improved, and on the other hand, the cooling liquid in the cooling liquid loop can be cooled, so that the heat is dissipated to the outside, and the circulation heat dissipation is facilitated.
With reference to the second aspect, as some optional embodiments, the heat dissipation member includes a radiator and a fan, the fan is connected to the radiator, one end of the radiator is connected to the electrical functional component, and the other end of the radiator is connected to the water pump, so that the heat dissipation member is capable of dissipating heat of the coolant in the coolant loop.
With reference to the second aspect, as some optional embodiments, the radiator further includes an active grille attached to the radiator, so that the heat dissipation capability of the coolant circuit can be further enhanced.
With reference to the second aspect, as some optional embodiments, the cooling liquid circuit further includes a fifth temperature sensor and a sixth temperature sensor, the fifth temperature sensor is disposed at the inlet end of the heat dissipation member, and the sixth temperature sensor is disposed at the outlet end of the heat dissipation member, so that the temperature of the cooling liquid passing through the heat dissipation member can be monitored in real time, and the power of the water pump can be adjusted according to the temperature.
In a third aspect, the present application also provides a computer-readable storage medium having a computer program stored thereon, which, when run on a computer, causes the computer to perform the method described above.
The invention adopting the technical scheme has the advantages that:
1. the oil-cooled motor, the cooling liquid loop and the cooling oil loop are matched with each other, and the cooling liquid loop and the cooling oil loop are arranged in series, so that the cooling liquid loop and the cooling oil loop can adjust the transient temperature of the oil-cooled electric drive system, the heat dissipation capacity of the whole system can be improved, and the output capacity of the oil-cooled motor can be improved;
2. by adopting the parallel control cooling liquid loop and the cooling oil loop, the cooling liquid loop and the cooling oil loop can be synchronously controlled to dissipate heat, the hysteresis of the existing temperature control method can be reduced, the output power of the oil-cooled motor cannot be limited, and the reliability of the system and the experience of a user can be improved.
Drawings
The present application can be further illustrated by the non-limiting examples given in the figures. It is to be understood that the following drawings illustrate only certain embodiments of this application and are therefore not to be considered limiting of scope, for those skilled in the art will appreciate that other related drawings may be made in accordance therewith without the exercise of inventive faculty;
fig. 1 is a first block diagram of a temperature control device provided in an embodiment of the present application;
fig. 2 is a second block diagram of a temperature control device according to an embodiment of the present disclosure;
fig. 3 is a third block diagram of a temperature control device provided in the embodiment of the present application;
FIG. 4 is a first schematic flow chart illustrating a method for transient temperature control of an oil cooling electric drive system according to an embodiment of the present disclosure;
FIG. 5 is a schematic flow chart diagram II illustrating a transient temperature control method for an oil cooling electric drive system according to an embodiment of the present application;
the main element symbols are as follows:
the oil-cooled motor comprises an oil-cooled motor 1, a stator 101, a rotor 102, a second temperature sensor 103, a third temperature sensor 104, an oil storage tank 105, a fourth temperature sensor 106, a first temperature sensor 107, a filter 11, an oil pump 12 and a plate heat exchanger 13;
the electric function 2, the radiator 21, the fan 22, the water pump 23, the sixth temperature sensor 24, the fifth temperature sensor 25, the active air intake grille 26.
Detailed Description
The following description of the embodiments of the present invention is provided by way of specific examples, and those skilled in the art will appreciate the advantages and utilities of the present invention from the disclosure herein. It should be noted that the drawings provided in the following embodiments are only for illustrative purposes, are schematic drawings rather than actual drawings, and are not to be construed as limiting the invention, and in order to better illustrate the embodiments of the invention, some components in the drawings may be omitted, enlarged or reduced, and do not represent the size of an actual product; it will be understood by those skilled in the art that certain well-known structures in the drawings and descriptions thereof may be omitted.
The same or similar reference numerals in the drawings of the embodiments of the present invention correspond to the same or similar components, and in the description of the present invention, it should be understood that if there are terms such as "upper", "lower", "left", "right", "front", "back", etc., indicating orientations or positional relationships based on those shown in the drawings, it is only for convenience of description and simplicity of description, but not for indicating or implying that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore, the terms describing the positional relationships in the drawings are used only for exemplary illustration and are not to be construed as limitations of the present invention, and specific meanings of the above terms may be understood by those skilled in the art according to specific situations, and in the description of the present application, the terms such as "first", "second", etc., are used only for distinguishing descriptions and are not to indicate or imply relative importance.
As shown in fig. 1 to 3, an embodiment of the present application provides a temperature control apparatus including an oil-cooled motor 1, a coolant circuit, and a cooling oil circuit. The cooling oil return circuit passes through the pipeline intercommunication with the cold motor of oil, and the cooling oil return circuit is used for the control of the cold motor transient state temperature of oil, and the coolant liquid return circuit is used for the temperature control to the cooling oil return circuit, and coolant liquid return circuit and cooling oil return circuit parallel control make coolant liquid return circuit and cooling oil return circuit linkage, can improve the heat-sinking capability of oil cooling electric drive system to can promote the output of the cold motor of oil, and then can promote user's the experience of driving and feel.
In some alternative embodiments, as shown in fig. 1, the cooling oil circuit includes a filter 11, an oil pump 12, a plate heat exchanger 13, and an oil pipe, the output end of the oil-cooled motor 1 is communicated with the filter 11, and the cooling oil passing through the oil-cooled motor 1 can be filtered by the filter 11. The input of oil pump 12 and the output of filter 11 communicate, and the output of oil pump 12 and the input of plate heat exchanger 13 communicate, and oil piping connection is between the output of plate heat exchanger 13 and oil-cooled motor 1 input, and the cooling oil is in oil piping. When the oil pump 12 during operation, can make the cooling oil circulate between filter 11, oil pump 12, plate heat exchanger 13 and oil-cooled motor 1 to dispel the heat to the cooling oil through plate heat exchanger 13, thereby can dispel the heat with the cooling oil after oil-cooled motor 1, and then can control the transient state temperature of oil-cooled motor 1, be favorable to promoting the output of oil-cooled motor 1.
In some alternative embodiments, as shown in fig. 2, the oil-cooled motor 1 includes a stator 101, a rotor 102, an oil reservoir 105, and a temperature sensor. The oil storage tank 105 is assembled on one side of the rotor 102, the rotor 102 penetrates out of the stator 101, and cooling oil in the oil storage tank 105 takes away heat generated by the working of the motor stator and the motor rotor through the stator 101 and the rotor 102 in the circulating process, so that the continuous working of the oil-cooled motor 1 is facilitated. Temperature sensors are mounted on the stator 101, the rotor 102 and the oil storage tank 105, and the temperature of the cooling oil passing through the motor stator, the motor rotor and the oil storage tank 105 can be monitored in real time through the temperature sensors.
In this embodiment, the temperature sensors include a first temperature sensor 107, a second temperature sensor 103, a third temperature sensor 104 and a fourth temperature sensor 106, and the first temperature sensor 107 is mounted at an inlet of the oil-cooled motor 1 for monitoring the temperature of the cooling oil entering the oil-cooled motor 1 in real time. A second temperature sensor 103 is mounted at the stator 101 for monitoring the cooling effect of the cooling oil on the stator 101 in real time. A third temperature sensor 103 is mounted at the rotor 102 for monitoring the cooling effect of the cooling oil on the rotor 102 in real time. A fourth temperature sensor 106 is provided on the oil reservoir 105 for monitoring the temperature of the cooling oil in the oil reservoir 105 in real time.
Through first temperature sensor 107, second temperature sensor 103, mutually supporting of third temperature sensor 104 and fourth temperature sensor 106, can the real-time supervision cooling oil pass through motor stator, electric motor rotor, the temperature of oil storage tank 105, and the temperature that real-time supervision cooling oil got into motor stator and electric motor rotor, first temperature sensor 107 can be gathered to oil-cooled machine controller, second temperature sensor 103, third temperature sensor 104 and fourth temperature sensor 106's data, thereby can be according to the data of gathering, the output of adjustment oil pump 12, make oil-cooled motor 1 no longer be subject to the temperature, be favorable to the output capacity promotion of oil-cooled motor 1.
In this embodiment, the cooling oil loop further includes an oil-cooled motor controller, and the oil-cooled motor controller is used for controlling the input power of the oil pump 12, i.e., controlling the rotation speed of the oil pump 12, and can control the heat exchange capacity of the cooling oil with the rotor and the stator by controlling the rotation speed of the oil pump 12, so as to control the transient temperature of the oil-cooled motor 1 and collect the working parameters of the oil pump 12.
In some optional embodiments, as shown in fig. 1, the cooling liquid loop includes a water pump 23, a heat sink, and an electrical function element 2, an input end of the water pump 23 is connected to the heat sink, an output end of the water pump 23 is connected to the plate heat exchanger 13 through a pipeline, so that the cooling liquid can exchange heat with the cooling oil passing through the plate heat exchanger 13, the cooling liquid exists in the pipeline, and the cooling liquid contains glycol. One end of the electric functional component 2 is connected to the plate heat exchanger 13, and the other end is connected to the heat dissipation member, and is used for controlling the rotating speed of the water pump 23 and the working state of the heat dissipation member, so as to control the heat dissipation capability of the cooling liquid.
In an alternative embodiment, as shown in fig. 3, the heat sink includes a radiator 21 and a fan 22, the fan 22 is fixedly connected to the radiator 21, an input end of the radiator 21 is connected to the thermal management controller, an output end of the radiator 21 is connected to an input end of a water pump 23, the radiator 21 and the fan 22 cooperate with each other to dissipate the coolant in the coolant circuit, and the fan 22 operates to dissipate the heat of the coolant and the radiator 21 to the external environment.
In an alternative embodiment, the radiator element may further include an active grille 26, the active grille 26 is fixedly connected to the other side of the radiator 21, and the operation of the active grille 26 reduces the wind resistance of the radiation during the radiation of the fan 22. The heat dissipation capacity of the coolant circuit can be further enhanced by the cooperation of the radiator 21, the fan 22 and the active grille shutter 26.
In this embodiment, the electrical function part 2 further includes a thermal management controller, and the thermal management controller is configured to control input powers of the water pump 23, the radiator 21, the fan 22, and the active grille 26, and collect operating state parameters of the water pump 23, the radiator 21, the fan 22, and the active grille 26.
In this embodiment, the cooling liquid circuit further comprises a fifth temperature sensor 25 and a sixth temperature sensor 24, and the fifth temperature sensor 25 is mounted at the inlet end of the radiator 21 for monitoring the temperature of the cooling liquid entering the radiator 21 in real time. The sixth temperature sensor 24 is assembled at the outlet end of the radiator 21 and used for monitoring the temperature of the cooling liquid passing through the radiator 21 in real time, and the thermal management controller can acquire data of the fifth temperature sensor 25 and the sixth temperature sensor 24, so that the power of the water pump 23 can be adjusted according to the temperature.
Referring to fig. 4-5, an embodiment of the present application further provides a transient temperature control method for an oil cooling electric drive system, which is applied to a temperature control device according to the above embodiment, the method includes:
acquiring target output power P1 and current output power P2 of the oil cold-electric drive system;
according to the driving condition, when the output power of the oil-cooled motor changes, control signals enter the oil-cooled motor controller and the thermal management controller at the same time, the ratio of the target output power P1 to the current output power P2 is obtained, the gears of the cooling liquid loop and the cooling oil loop are changed according to the ratio, and the cooling liquid loop and the cooling oil loop are controlled in parallel;
the oil-cooled motor controller is used for controlling the input power of the cooling oil loop, and the thermal management controller is used for controlling the input power of the cooling liquid loop.
The existing transient temperature control method of the oil cooling electric drive system is mainly based on line type control, namely when a user needs to improve the output torque of the oil cooling electric drive system, the temperature control capability needs to be correspondingly adjusted. Based on the torque change signal, the cooling oil loop is adjusted to improve the heat dissipation capacity, namely the rotating speed of the oil pump is increased to increase the heat dissipation capacity, and when the adjustment of the oil cooling loop cannot provide enough heat dissipation capacity, the cooling liquid loop is adjusted to improve the heat dissipation capacity, so that the transient temperature control of the oil-cold-electric drive system is completed. The main defects of the linear control mode are as follows: in the case of a series-connected temperature control device, there is a problem of temperature hysteresis control, which may cause damage to a motor.
The temperature control method with the cooling liquid loop and the cooling oil loop in parallel is adopted, the cooling liquid loop and the cooling oil loop can be synchronously controlled to work, the working state of the oil-cooled motor can be controlled according to the running states of vehicles in different states, the transient temperature of an oil cooling electric driving system can be controlled, the working of the oil-cooled motor 1 is not limited by the temperature state, and the driving experience can be improved.
It will be appreciated that the oil-cooled motor controller is used to control the speed of the oil pump 12 in the coolant circuit and that the thermal management controller is used to control the power input to the water pump 23 and the radiator elements in the coolant circuit.
It can be understood that, when the controller of the cooling oil loop obtains the demand of the output power of the electric drive system, that is, when the user needs to accelerate or climb the slope to increase the output power of the oil-cooled motor 1, the power ratio of P1/P2 is obtained, where P1 is the target output power, P2 is the current output power, and P1/P2 > 1, and after obtaining this ratio, according to the power of 3/4 of the ratio of P1/P2, the power ratio is used as the input power increase rate of the oil pump 12, that is, the current oil pump input power P 0 oil pump Multiplying the ratio of P1/P2 by the power of 3/4 to serve as the target input power of the oil pump 12, and if the target input power of the oil pump 12 after the multiplying power is increased is larger than the upper limit of the gear at which the current oil pump input power is positioned, the target input power of the oil pump 12 is according to the current oil pump input power P 0 oil pump Multiplied by the ratio of P1/P2 to the power of 3/4. If the input power of the oil pump 12 after the multiplying power is increased is not largeThe upper limit of the gear at which the current oil pump input power is located; the input power of the oil pump 12 is maintained unchanged;
in the present embodiment, the gear of the oil pump 12 can be set to the highest input power of the oil pump 0W and to the first gear of the highest input power P × 10%.
As can be understood, in the process of adjusting the input power of the oil pump 12 by the oil-cooled motor controller based on the change of the output power requirement of the oil-cooled motor 1; when a controller of the cooling liquid loop obtains the requirement of the output power of the electric drive system, namely when a user needs to accelerate or climb the slope and the like to improve the output power of the oil-cooled motor 1, a power ratio of P1/P2 is obtained, wherein P1 is target output power, P2 is current output power, and P1/P2 is more than 1, after the ratio is obtained, the ratio is used as the input power improving multiplying power of the fan 22 according to the opening 3/4 power of the ratio of P1/P2, namely the current input power P of the fan 22 0 Fan Multiplying the power of 3/4 of the ratio of P1/P2 as the target input power of the fan 22, and if the target input power of the fan 22 after the multiplying power is increased is larger than the upper limit of the gear at which the current input power of the fan 22 is positioned, determining the target input power of the fan 22 according to the current input power P of the fan 0 Fan Multiplied by the ratio of P1/P2 to the power of 3/4 of the opening. If the fan input power of the fan 22 after the multiplying power is increased is not greater than the upper limit of the gear where the current fan input power is located; the input power to the fan 22 is maintained constant.
For the water pump 23 of the cooling liquid loop, if the input power is increased by the oil pump 12 and the input power is increased by the fan 22, the water pump 23 maintains the current gear; if the input power of the oil pump and the input power of the fan are not changed, the water pump 23 is directly lifted to a gear, and the water pump 23 outputs the power of the middle value of the next gear of the water pump 23.
Referring to fig. 5, in the transient temperature control method of the oil-cooled electric drive system, when the active grille 26 is mounted on the other side of the radiator 21, the active grille 26 is used to further improve the heat dissipation efficiency of the radiator to the coolant in order to reduce the wind resistance.
Wherein, when the controller of the cooling oil loop obtains the demand of the output power of the electric drive system, namely, the user needs to accelerate or climb the slope and the like to improve the oil cooling electricityObtaining a power ratio of P1/P2 when the output power of the engine 1 is obtained, wherein P1 is target output power, P2 is current output power, P1/P2 is more than 1, and after the ratio is obtained, according to the opening 3/4 power of the ratio of P1/P2, the ratio is used as the input power increasing multiplying power of the oil pump 12, namely the current input power P of the oil pump 0 oil pump Multiplying the power of opening by the power of 3/4 of the ratio P1/P2 to serve as the target input power of the oil pump 12, and if the target input power of the oil pump 12 after the multiplying power is increased is larger than the upper limit of the gear where the current oil pump input power is located, the target input power of the oil pump 12 is determined according to the current oil pump input power P 0 oil pump Multiplied by the ratio of P1/P2 to the power of 3/4. If the input power of the oil pump 12 after the multiplying power is increased is not greater than the upper limit of the gear where the current input power of the oil pump is located; the input power of the oil pump 12 is maintained unchanged;
in the present embodiment, the gear of the oil pump 12 can be set to the highest input power of the oil pump 0W and to the first gear of the highest input power P × 10%.
As can be understood, in the process of adjusting the input power of the oil pump by the oil-cooled motor controller based on the change of the output power requirement of the oil-cooled motor; when a controller of the cooling liquid loop acquires the requirement of the output power of the electric drive system, namely when a user needs to accelerate or climb the slope and the like to improve the output power of the oil-cooled motor, the power ratio of P1/P2 is acquired, wherein P1 is the target output power, P2 is the current output power, and after the ratio is acquired, the ratio is used as the target opening degree of the active air intake grille 26 according to the multiplying power of P1/P2 and according to 1.2 times of the multiplying power; when the maximum opening degree of the active air inlet grille 26 is larger than or equal to 100 percent, the opening power is taken as the input power increasing multiplying power of the fan 22 according to the opening power of 3/4 times of the ratio of P1/P2, namely the current input power P of the fan 22 0 Fan Multiplying the power of 3/4 of the ratio of P1/P2 as the target input power of the fan 22, and if the target input power of the fan 22 after the multiplying power is increased is larger than the upper limit of the gear at which the current input power of the fan 22 is positioned, determining the target input power of the fan 22 according to the current input power P of the fan 0 Fan Multiplied by the ratio of P1/P2 to the power of 3/4 of the opening. If the target opening of the active grille 26 is not greater than 100%, the input power to the fan 22 is maintained.
For the water pump 23 of the cooling liquid loop, if the input power is increased by the oil pump 12 and the input power is increased by the fan 22, the current gear of the water pump 23 is kept unchanged; if the input power of the oil pump and the input power of the fan are not changed, the water pump 23 is directly lifted to a gear, and the water pump 23 outputs the power of the middle value of the next gear of the water pump 23.
The embodiment of the application also provides a computer readable storage medium. The computer-readable storage medium has stored therein a computer program that, when run on a computer, causes the computer to execute the brake control method as described in the above-described embodiments.
From the above description of the embodiments, it is clear to those skilled in the art that the present application can be implemented by hardware, or by software plus a necessary general hardware platform, and based on such understanding, the technical solution of the present application can be embodied in the form of a software product, which can be stored in a non-volatile storage medium (which can be a CD-ROM, a usb disk, a removable hard disk, etc.), and includes several instructions to enable a computer device (which can be a personal computer, a braking device, or a network device, etc.) to execute the method described in the embodiments of the present application.
In summary, the embodiments of the present application provide a method and an apparatus for controlling a transient temperature of an oil cooling electric drive system, and a storage medium, which improve a heat dissipation capability of the entire system by a linkage between a cooling oil loop and a cooling liquid loop, thereby improving an output capability of a motor; meanwhile, the hysteresis of the temperature control method is reduced, and the reliability of the system is improved by using a parallel control method.
In the embodiments provided in the present application, it should be understood that the disclosed apparatus, system, and method may be implemented in other ways. The apparatus, system, and method embodiments described above are illustrative only, as the flowcharts and block diagrams in the figures illustrate the architecture, functionality, and operation of possible implementations of systems, methods and computer program products according to various embodiments of the present application. In this regard, each block in the flowchart or block diagrams may represent a module, segment, or portion of code, which comprises one or more executable instructions for implementing the specified logical function(s). It will also be noted that each block of the block diagrams and/or flowchart illustration, and combinations of blocks in the block diagrams and/or flowchart illustration, can be implemented by special purpose hardware-based systems which perform the specified functions or acts, or combinations of special purpose hardware and computer instructions. In addition, functional modules in the embodiments of the present application may be integrated together to form an independent part, or each module may exist separately, or two or more modules may be integrated to form an independent part.
The above description is only an example of the present application and is not intended to limit the scope of the present application, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, improvement and the like made within the spirit and principle of the present application shall be included in the protection scope of the present application.
Claims (13)
1. The transient temperature control method of the oil cooling electric drive system is applied to a temperature control device and is characterized by comprising the following steps,
acquiring target output power P1 and current output power P2 of an oil-cold-electric drive system;
according to the driving condition, when the output power of the oil-cooled motor changes, control signals enter the oil-cooled motor controller and the thermal management controller at the same time, the ratio of the target output power P1 to the current output power P2 is obtained, the gears of the cooling liquid loop and the cooling oil loop are changed according to the ratio, and the cooling liquid loop and the cooling oil loop are controlled in parallel;
the oil-cooled motor controller is used for controlling the input power of the cooling oil loop, and the thermal management controller is used for controlling the input power of the cooling liquid loop.
2. The method of claim 1, wherein the transient temperature control comprises: the method further comprises the step of using the ratio of the target output power P1 to the current output power P2 and the power of 3/4 of the ratio of P1/P2 as the power lifting multiplying power of the oil pump during control of the cooling oil loop;
when the input power of the oil pump after the lifting multiplying power of the oil pump is the next oil pump gear, the oil pump directly enters the next power gear; and when the input power of the oil pump after the lifting multiplying power of the oil pump is smaller than the input power of the next oil pump gear, the input power of the oil pump is unchanged.
3. The method of claim 1, wherein the transient temperature control comprises: the method also comprises the steps that during cooling liquid loop control, the input power of the fan is changed according to the ratio of the target output power P1 to the current output power P2 and the multiplying power of P1/P2;
when the input power is larger than or equal to the gear of the fan, adjusting the input power of the fan to enter the next gear; and when the input power is smaller than the current gear, the power of the fan is not adjusted.
4. A method of transient temperature control for an oil cooling electric drive system as set forth in claim 3 wherein: the method also comprises the steps that during cooling liquid loop control, the input power of the water pump is changed according to the ratio of the target output power P1 to the current output power P2 and the multiplying power of P1/P2;
when the oil pump lifts the gear and the fan lifts the gear, the water pump does not lift the gear; when the oil pump does not lift the gear or the fan does not lift the gear, the water pump directly lifts one gear.
5. A method of transient temperature control for an oil cooling electric drive system as set forth in claim 3 wherein: the method further comprises the step of changing the opening degree of the active air intake grille according to the multiplying power of P1/P2 according to the ratio of the target output power P1 to the current output power P2 during the control of the cooling liquid loop;
when the active air inlet grille enters the maximum opening, the input power of the fan is changed according to the multiplying power of P1/P2, and if the input power is larger than or equal to the gear of the fan, the input power of the fan is adjusted to enter the next gear; if the active air inlet grille is smaller than the maximum opening, the power of the fan is not adjusted;
when the oil pump raises the gear and the fan raises the gear, the water pump does not raise the gear; when the oil pump does not lift the gear or the fan does not lift the gear, the water pump directly lifts one gear.
6. A temperature control device applied to the temperature control method according to any one of claims 1 to 5, wherein the temperature control device comprises an oil-cooled motor, a coolant circuit, an oil-cooled motor controller and a thermal management controller, the coolant circuit is communicated with the oil-cooled motor, the oil-cooled motor comprises a stator, a rotor, an oil storage tank and a temperature sensor, the oil storage tank is arranged on one side of the rotor, the temperature sensor is arranged on the stator, the rotor and the oil storage tank, and the coolant circuit is communicated with the stator, the rotor and the oil storage tank.
7. A temperature control apparatus according to claim 6, wherein: the temperature sensor comprises a first temperature sensor, a second temperature sensor, a third temperature sensor and a fourth temperature sensor, the first temperature sensor is arranged at an inlet of the oil-cooled motor, the second temperature sensor is arranged at a stator, the third temperature sensor is arranged at a rotor, and the fourth temperature sensor is arranged on the oil storage tank.
8. A temperature control apparatus according to claim 6, wherein: the cooling oil loop comprises a filter, an oil pump, a plate heat exchanger and an oil pipe, the oil cooling motor is communicated with the filter, one end of the oil pump is communicated with the filter, the other end of the oil pump is communicated with the plate heat exchanger, the oil pipe is connected between the plate heat exchanger and the oil cooling motor, and the oil cooling motor controller controls the input power of the oil pump.
9. A temperature control apparatus according to claim 6, wherein: the cooling liquid circuit comprises a water pump, a radiating piece and an electric function piece, one end of the water pump is connected with the radiating piece, the other end of the water pump is connected with the cooling oil circuit, one end of the electric function piece is connected onto the cooling oil circuit, the other end of the electric function piece is connected with the radiating piece, and the thermal management controller is used for controlling the input power of the water pump and the radiating piece.
10. A temperature control apparatus according to claim 9, wherein: the heat dissipation piece comprises a radiator and a fan, the fan is connected to the radiator, one end of the radiator is connected with the electrical function piece, and the other end of the radiator is connected with the water pump.
11. A temperature control apparatus according to claim 9, wherein: the heat dissipation piece further comprises an active air inlet grille connected to the radiator.
12. A temperature control apparatus according to claim 9, wherein: the cooling liquid loop further comprises a fifth temperature sensor and a sixth temperature sensor, the fifth temperature sensor is arranged at the inlet end of the heat dissipation piece, and the sixth temperature sensor is arranged at the outlet end of the heat dissipation piece.
13. A computer-readable storage medium, in which a computer program is stored which, when run on a computer, causes the computer to carry out the method according to any one of claims 1-5.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211529334.9A CN115864742A (en) | 2022-11-30 | 2022-11-30 | Transient temperature control method and device for oil cooling electric drive system and storage medium |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211529334.9A CN115864742A (en) | 2022-11-30 | 2022-11-30 | Transient temperature control method and device for oil cooling electric drive system and storage medium |
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| CN115864742A true CN115864742A (en) | 2023-03-28 |
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| CN202211529334.9A Pending CN115864742A (en) | 2022-11-30 | 2022-11-30 | Transient temperature control method and device for oil cooling electric drive system and storage medium |
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| CN (1) | CN115864742A (en) |
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